diff --git a/composer.json b/composer.json
index 11078c5..52307b6 100644
--- a/composer.json
+++ b/composer.json
@@ -13,7 +13,8 @@
         }
     ],
     "require": {
-        "php": ">=7.1"
+        "php": ">=7.1",
+        "ext-sockets": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0 | ^8.0",